A silent film is a film with no synchronized recorded sound and in particular, no audible dialogue. In silent films for entertainment, the plot may be conveyed by the use of title cards , written indications of the plot and key dialogue lines. The idea of combining motion pictures with recorded sound is nearly as old as film itself, but because of the technical challenges involved, the introduction of synchronized dialogue became practical only in the late 's with the perfection of the Audion amplifier tube and the advent of the Vitaphone system.
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More information. All models were 18 years of age or older at the time of depiction. Parents: Lobstertube.
Virgin Hyperloop One is testing a system that would put passengers in pods hurtling through vacuum tubes. Other companies are moving ahead with similar plans. The system aims to move people and cargo through tubes in wheel-less pods. By Eric A. But in the desert outside Las Vegas, the transportation ambitions still seem limitless. Here, engineers working for Virgin Hyperloop One are testing a radically different type of mass transit: one that aims to move people and cargo in small wheel-less pods in a vacuum tube at speeds that could exceed miles per hour. The concept was promoted by Elon Musk, of electric-car and private-rocket renown, and then offered by one of his companies as open-source technology available to all. It works by propelling pods using magnetic levitation through a low-pressure, near-vacuum tube. The low pressure minimizes friction and air resistance, greatly reducing the power needed.
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